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RE: CDATA in attribute values

From: Chris Ridd <chris.ridd@messagingdirect.com>
Date: Thu, 7 Dec 2000 06:04:13 -0500 (EST)
To: www-html@w3.org
Message-ID: <13580000.976187017@bagheera.isode.com>
Christian Smith <csmith@barebones.com> wrote:
> On Wednesday, December 6, 2000 at 19:30, david.woolley@bts.co.uk (Dave  J
> Woolley) wrote:
> 
>> 	[DJW:]  No.
>> 
>> 	Naked &'s and <'s are not permitted in attribute
>> 	values, and XML directives are definitely not
>> 	recognized in that context.
>> 
>> 	See 
>> 	<http://www.w3.org/TR/2000/REC-xml-20001006#sec-common-syn>,
>> production number [10].
>> 
>> 	Whilst it is just conceivable that some version of XHTML
>> 	has extended ALT to allow it to include XML text for
>> 	recursive expansion, such a change would not be understood
>> 	by a general validator, because it requires knowledge beyond
>> 	the content of the DTD, and would not be backwards compatible,
>> 	because of the need to double escape < when one doesn't
>> 	want interpreted as the start of a tag.
> 
> Ok, but how does this jive with the definition of CDATA sections:
> 
> http://www.w3.org/TR/2000/REC-xml-20001006#sec-cdata-sect
> 
>	 2.7 CDATA Sections
> 
>	 [Definition:] CDATA sections may occur anywhere
>	 character data may occur; they are used to escape
>	 blocks of text containing characters which would
>	 otherwise be recognized as markup. CDATA sections
>	 begin with the string "<![CDATA[" and end with the
>	 string "]]>":
> 
> 
> I realize that using this in an XHTML document would create something
> not supported by the validator or by a current HTML renderer, but is it
> valid XML to use a CDATA section in an attribute value if that attribute
> is defined as having a content model of CDATA?
> 
> 
> -- 
> Christian Smith  |  csmith@barebones.com  |  http://web.barebones.com
> 
> He who dies with the most friends... Is still dead!
> 

Joe English has a useful document entitled "CDATA Confusion", which may be
relevant here.

	http://www.flightlab.com/~joe/sgml/cdata.html

I think section 2 provides the answer.

Cheers,

Chris
Received on Thursday, 7 December 2000 06:34:06 GMT

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